155937351780449 has 2 divisors, whose sum is σ = 155937351780450. Its totient is φ = 155937351780448.

The previous prime is 155937351780443. The next prime is 155937351780503. The reversal of 155937351780449 is 944087153739551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107433370110049 + 48503981670400 = 10365007^2 + 6964480^2 .

It is an emirp because it is prime and its reverse (944087153739551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155937351780449 - 2⁸ = 155937351780193 is a prime.

It is not a weakly prime, because it can be changed into another prime (155937351780443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77968675890224 + 77968675890225.

It is an arithmetic number, because the mean of its divisors is an integer number (77968675890225).

Almost surely, 2^{155937351780449} is an apocalyptic number.

It is an amenable number.

155937351780449 is a deficient number, since it is larger than the sum of its proper divisors (1).

155937351780449 is an equidigital number, since it uses as much as digits as its factorization.

155937351780449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 571536000, while the sum is 71.

The spelling of 155937351780449 in words is "one hundred fifty-five trillion, nine hundred thirty-seven billion, three hundred fifty-one million, seven hundred eighty thousand, four hundred forty-nine".